Gypsum and organic matter distribution in a mixed construction and demolition waste sorting process and their possible removal from outputs

Montero, Alonso; Tojo, Yasumasa; Matsuo, Takayuki; Matsuto, Toshihiko; Yamada, Masato; Asakura, Hiroshi; Ono, Yusaku

doi:10.1016/j.jhazmat.2009.10.072

Cited by 31 publications

(16 citation statements)

References 12 publications

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“…As it is used to coat internal walls in many constructions, gypsum is liberally distributed throughout demolition waste where it exists as fragments and dust between 17%and 27% of the mass of CDW (Townsend et al, 2000). Once it has been mixed, it is challenging to separate, and although some novel methods of separation have been suggested (Montero et al, 2010), manual separation is often the only effective method (Asakura, 2013).…”

Section: Gypsummentioning

confidence: 99%

Construction and demolition waste management: A systematic review of risks to occupational and public health

Cook¹,

Velis²

2020

Preprint

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Despite the relatively benign material composition of construction and demolition waste (CDW), its mismanagement can result in considerable harm to human health, not only for the 200 million workers in the sector but also for those who live and work in proximity to construction and demolition activities. The population and workforce in low- and middle-income countries (LIMICs) is most at risk, and therefore we have focussed the attention of a systematic review of evidence that associates CDW with negative health and safety outcomes in those countries. We used PRISMA adapted guidelines to review more than 3,000 publications, narrowed to 49 key sources that provide data on hazard generation, exposure and/or risk. Subsequently, hazard-pathway-receptor scenarios/combinations were formulated, enabling indicative ranking and comparison of the relative harm caused to different groups. Though the evidential basis is sparse, there is a strong indication that the combustible fraction of CDW is mismanaged and disposed of by open burning in many LIMICs, including increasing quantities of plastics used in the sector. It is likely that the off-cuts/residues of these materials will be burned; the high chlorides-content PVC represents a serious risk when combusted in open, uncontrolled fires due to the release of dioxins and related substances. A long-standing and well-known hazard, asbestos continues to represent a threat to construction and demolition workers throughout the world. Despite being banned in most countries, exposure to asbestos particles is thought to claim the lives of a quarter of a million people every year. Though much of this risk is concentrated in high income countries where it has been used over more than half century, it is anticipated that more than half of all deaths from asbestos in the coming decades will take place in India where many asbestos products are still on the market, without any sign of prohibition. Overall highest comparatively risks are concentrated in LIMICs where the majority of workers are informal and highly vulnerable to hazard exposure. Combined with the sheer quantities of CDW, the risks can anticipated to persist – urgent attention to risk mitigation and control is needed.

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Section: Gypsummentioning

confidence: 99%

Construction and demolition waste management: A systematic review of risks to occupational and public health

Cook¹,

Velis²

2020

Preprint

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“…Construction and demolition debris sand (CDDS) is the fine fraction (around 40-50% of the total waste) of solid waste originating from building, demolition and renovation of buildings and roads, containing high amounts of gypsum (de Vries, 2006;Montero et al, 2010). The content of gypsum (by mass) in CDDS ranges from 1.5% to 9.5% (Jang & Townsend, 2001;Kijjanapanich et al,.…”

Section: Construction and Demolition Debris Sandmentioning

confidence: 99%

“…The amount of gypsum going to a landfill can be reduced by separating the fine fraction from mixed construction and demolition debris. However, final disposal will require the removal of gypsum from CDDS (Montero et al, 2010).…”

Section: Construction and Demolition Debris Sandmentioning

confidence: 99%

Treatment and reuse of solid materials containing inorganic sulfur compounds

Tichý¹,

Kijjanapanich²,

Lens³

2020

Environmental Technologies to Treat Sulphur Pollution: Principles and Engineering

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In the environment, different types of solid phase systems can contain high concentrations of inorganic sulfurous compounds, e.g. ores, soils and sediments. The key criterion in the assessment of environmental risks of inorganic sulfurous compounds present in these materials is whether they remain bound to the solid phase or whether they are mobilized into the solution. Mobility of inorganic sulfur in natural water/solid biphasic systems is predominantly controlled by oxidative or reductive changes and precipitation constants of sulfurous compounds. In anaerobic environments, sulfur is encountered in its most reduced form, i.e. sulfidic form. Owing to the poor solubility of most sulfidic compounds, sulfurous compounds are predominantly immobile in anaerobic environments. On the contrary, in aerobic environments, the most stable inorganic sulfur compound is sulfate, which is usually very soluble in water. Reductive and oxidative changes of inorganic sulfurous compounds often involve an interaction with protons. Sulfur reduction is usually accompanied with alkalization of the environment, whereas sulfur oxidation often results in acidification. The general overview of the effects of reductive and oxidative

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“…Construction and demolition waste is the largest waste stream in the EU, including mining and quarrying wastes, accounting for 33% of all waste produced (Eurostat 2016), with fines constituting a major portion of the CDW (Jang, Townsend 2001). Huang et al (2002) reported fines <40 mm as representing 52% of CDW, and Montero et al (2010) reported 37.5% as fines <8 mm. CDW fines from Nordic construction and demolition sites typically contain significant amounts of wood since houses in this region are frequently based on timber structures.…”

Section: Introductionmentioning

confidence: 99%

“…), rendering conventional mechanical separation complex and expensive. In previous CDW studies conducted in Japan (Montero et al 2010), the feasibility of wet density-based separation of organic matter has been demonstrated, although a variety of separation steps implying an increasing complexity and higher costs was used. Di Maria et al (2013) investigated the use of soil washing equipment for use in the wet separation of residual municipal solid waste (MSW) fines.…”

Section: Introductionmentioning

confidence: 99%

Float-Sink Separation of Construction and Demolition Waste Fines

2018

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Landfilling and waste incineration are two major waste management options. However, due to their carbon content, some wastes may be unsuitable for these systems. Therefore, methods capable of removing organic carbon from wastes should be identified. One of these wastes is represented by construction and demolition fines. In this paper, we investigate the use of water in separating the waste by density, to verify the suitability of this method in the separation of carbon-containing materials, both in lab and field scale tests. The results obtained show that half of the carbon (measured as volatile solids) can be separated. However, this method fails to reliably produce a sink fraction suitable for landfilling, as it continues to be characterized by an excessively high organic material content.

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Gypsum and organic matter distribution in a mixed construction and demolition waste sorting process and their possible removal from outputs

Cited by 31 publications

References 12 publications

Construction and demolition waste management: A systematic review of risks to occupational and public health

Construction and demolition waste management: A systematic review of risks to occupational and public health

Treatment and reuse of solid materials containing inorganic sulfur compounds

Float-Sink Separation of Construction and Demolition Waste Fines

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